Cascade interrupt

[Systemkennung Linux <linux@mailhost.uni-koblenz.de>]

Hi all,

while playing around with the RM200 I had to find out that some of the
"RISC PC" class machines use the PICs in cascade mode while others don't.
This is completly opposed the the standard Intel PC design where the PICs
are always in cascade mode.  So just in case if you wonder why your
machine never gets high interrupts (>= 8) check this.

   Ralf